Method of mounting lathe turrets



METHOD OF MOUNTING LATHE TURRETS 3 Sheets-Sheet 1 Filed Jan. 7, 1946FIGJ;

i E 1: v NWT TH h 5 I ,1 A. 6

'r I 5m M h N 0 o m wr fm m U V Nov. 4, 1952 VIGO VON KROGH SUNDT2,616,162

METHOD OF MOUNTING LATHE TURRETS Filed Jan. 7, 1946 3 Sheets-Sheet 2FIG. 2.

W510 van Kra qh Szmdf IN VEN TOR.

ATTORNEY:

1952 VlGO VON KROGH SUNDT 2,616,162

METHOD OF MOUNTING LATHE TURRETS 3 Sheets-Sheet :5

Filed Jan. 7, 1946 W90 van Krogh Sandi INVENTOR.

ATTORNEY.

Patented Nov. 4, 1952 .METHQD F ,MOUNTIN G LATHE ,TURREIS Vigo von KroghSundt, Madison, 'Wis., 'assignor :to Gisholt *Machine .Company, Madison,'Wis., a corporation of Wisconsin Application Januaryfl, 1946, SerialNo. 639,533

2 LGlaims. '1 This invention relates to a method 'of turret mounting for'lathes.

One of the principal objects of theinvention is to increase the accuracyof indexing of the turret by substantially improving "the accuracy ofthe turret'mounting to support the turret at the severalindexedpositions.

Another .object of the invention is to improve the freedom from frictionin 'the rotation of .the turret to its indexed positions.

Another object is to provide a more accurate fit between the clampingsurfaces of the turret without increasing the resistance to rotationwhen unclamped.

Another object is to more accurately center and align the clampingsurfaces with the bearing support for the turret.

Another object is to simplify the assembly of the turret and mounting.

Other objects and advantages will be set forth in the description of themethod as applied to the "turret construction illustrated .in theaccompanying drawings.

In the drawings:

Figure .1 .is a vertical axial section through a turret and itsassembled mountin Fig. '2 isa similar view with the parts shown separateprior to assembly; and

Fig. 3 is a top plan view of the assembled turret with parts broken awayand sectioned.

The turret l is mounted ;for rotation upon the turret carriage 2 bymeans :of the bearing cartridge 3 disposed in a bore in the carriagewith a vertical axis and into which cartridge the central turret stem 4extends downwardly.

The turret l is generally hexagonal, having a fiat plate-like bottomwith upstanding side walls in the form of a hexagon. The turret bottomhas a vertical hole 5 for each index position and which is adapted toreceive the lock pin 6 carried by the turret carriage 2 to lock theturret in a selected indexed position.

A depending circumferential flange I on the turret has a.downwardly-facing clamping sur-- face 8 and a beveled upper surface 9adapted to cooperate with a similar circular flange ID on carriage 2having a corresponding upwardly facing clamping surface H and beveledlower surface l2. The flanges I and I0 fit in a clamping ring l3 whichis adapted to clamp the same together to hold the turret at any selectedindexed position.

The carriage 2 has an upwardly projecting circular flange M with acentral bore therein for receiving the cartridge 3 and providing a flattop s pport for a circumferential flange I 5 on the upper end of thecartridge to support the'cartridge thereon.

The cartridge "3 comprises a stationary outer sleeve I6 carrying a pairof opposed preferably pre-loaded tapered roller bearings l1 and 18 setinto the opposite ends thereof. The outer sleeve lfihasthe flange l 5which supports the cartridge, and a generally cylindrical body 19 whichis imachined and ground to fit in 'thebo're in thecarriage.

The inner rotary cone *2 0 of upperbearing l1 fit around the turret stem4 and has it upper surface engaging the underside of the turret bottomto support the turreton the bearing. The corresponding inner rotary cone21 of'lower bearing l,8 fits around the turret stem v4 and issupportedby .a collar 22 threaded onto the lower end of the stem 4 and screwed toa tightness which pro-loads the bearings agiven amount and secures theturret in place on the hearing as a support.

A vertical pin 23 extending upwardly from flange I4 engages in a hole inflange l5 and serves to retain the outer sleeve 16 of the bearingcartridge against turning.

In assembling the mounting, the bearing cartridge 3 with the taperedroller 'bearings is first assembled on the turret stem 4 and thebearings pre-loaded and secured in place by collar 22 threaded upon the.end of thestem. The turret nd its earin c trid e are the p s t on d onthe carriage 2 with'the cartridge fitting reasonably tight in the borein the carriage to center the turret, and the clamping face 8 of flange1 resting on clamping face II of the carriage.

The clamping faces 8 and H are then scraped or lapped to fit each otheraccurately while the turret is turned in the bearing cartridge 3 so thatthe clamping surfaces are true relative to the bearing support for theturret.

After the clamping surfaces 8 and II have been scraped, the turret andcartridge are raised from the carriage and a spacer washer 24 is placedupon the upper surface of flange 14. The turret and bearing cartridgeassembly are then again positioned on the carriage, the washer 24constituting an insert between flanges l4 and I5 and serving to supportthe assembly on the carriage with a predetermined clearance between theclamping surfaces 8 and II.

For this purpose the washer 24 is ground to the necessary thickness toproduce a uniform clearance preferably of about .002" between theclamping surfaces 8 and II.

By machining the upper surface of flange l4 simultaneously with themachining of the bore in the carriage, and by machining and grinding theunderside of flange l5 square with respect to the outer surface of thesleeve I6, and em ploying a Washer 24 ground to a uniform thickness, theturret will be supported with a uniform clearance between the clampingsurfaces 6 and H throughout their common circumference.

The clearance between the clamping surfaces 8 and H enables the turretto be turned readily by hand or by the indexing mechanism withoutfriction or drag between the surfaces, and when the turret is in aselected indexed position the clamp ring 13 may be tightened uponflanges I and If to draw the clamping surfaces into tight engagement andprevent turning of the turret.

The supporting of the turret for rotation solely by upper and loweranti-friction roller or ball bearings and without a bushing contactgreatly facilitates the turning and accurate positioning of the turretfor indexing.

The accurate scraping of the clamping surfaces with the turret mountedin its bearings insures alignment and centering of the surfaces relativeto the center of rotation for the turret. Heretofore, it has beennecessary to scrape the clamping surfaces without the bearing in placeand this has resulted in considerable inaccuracy in the indexing of theturret.

In order to obtain the required accuracy with respect to the indexing oftools in a lathe it is ordinarily necessary to index the turretaccurately to within less than about .0001 variance at 8 inches from thecenter. The present construction will index the turret to an accuracywell within the limit referred to, whereas former constructions wereunable to consistently obtain such accuracy.

The method of the invention'may be carried out with various turretconstructions wherein the bearing is mounted to be adjustably raised andis constructed to provide for its use during the method as stated.

I claim:

1. In the mounting of turrets for lathes and the like in which theturret is supported for rotation on a base member by a centralantifriction bearing and adapted to be clamped against rotation byengagement of a circular clamping surface thereon with a correspondingopposed stationary clamping surface on the sup- 4 port for the turret,assembling the turret and its bearing with the support under conditionsof adjustment wherein the clamping surfaces are in engagement and theturret is free to rotate, scraping the clamping surfaces to fit the sameto each other while rotating the turret in its bearing on the same axisof rotation as the final axis of rotation for the turret in service, andthereafter adjusting the turret support to provide a predetermined smalluniform clearance between said clamping surfaces for free rotation ofthe turret on said bearing.

2. In the mounting of turrets for lathes and the like in which theturret is supported for rotation on a base member by a centralantifriction bearing and adapted to be clamped against rotation byengagement of a circular clamping surface thereon with a correspondingopposed stationary clamping surface on the support for the turret,assembling the turret and its bearing with the support under conditionsof adjustment wherein the clamping surfaces are in engagement and theturret is free to rotate, scraping the clamping surfaces to fit the sameto each other while rotating the turret in its bearing on the same axisof rotation as the final axis of rotation for the turret in service, andthereafter adjusting the height of said bearing relative to the supportto provide a predeter-.

mined small uniform clearance between said clamping surfaces for freerotation of the-turret on said bearing.

VIGO VON KROGI-I SUNDT.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,446,829 Burrell et a1 Feb. 27,1923 1,953,876 Burrell Apr. 3, 1934 1,970,276 Bullard Aug. 14, 19342,037,206 Boden Apr. 14, 1936 2,135,639 Gorham Nov. 8, 1938 2,370,367Marsilius Feb. 27, 1945 2,417,366 Kylin et al. Mar. 11, 1947 2,445,386Darash July 20, 1948 FOREIGN PATENTS Number Country Date 524,239 GreatBritain Aug. 1, 1940

